Unattended-upgrade

unattended-upgrade provides automatic installation of package upgrades, including security upgrades.

• Man page: http://manpages.ubuntu.com/manpages/bionic/man8/unattended-upgrade.8.html
• Debian wiki: https://wiki.debian.org/UnattendedUpgrades

• Configuration: /etc/apt/apt.conf.d/50unattended-upgrades

unattended-upgrade 
(no output)

unattended-upgrade -v
Starting unattended upgrades script
Allowed origins are: o=Ubuntu,a=focal, o=Ubuntu,a=focal-security, o=UbuntuESMApps,a=focal-apps-security, o=UbuntuESM,a=focal-infra-security
Initial blacklist:
Initial whitelist (not strict):

unattended-upgrade -v --dry-run
Starting unattended upgrades script
Allowed origins are: o=Ubuntu,a=focal, o=Ubuntu,a=focal-security, o=UbuntuESMApps,a=focal-apps-security, o=UbuntuESM,a=focal-infra-security
Initial blacklist:
Initial whitelist (not strict):
No packages found that can be upgraded unattended and no pending auto-removals
The list of kept packages can't be calculated in dry-run mode.

unattended-upgrade -v
System is on battery power, stopping

See also

• APT: wajig, apt-cache, add-apt-repository PPA, apt [ install | remove |purge | show | list | changelog | update | upgrade], do-release-upgrade, apt-mark, apt full-upgrade, sources.list, APT Automatic updates, unattended-upgrade, apt-transport-https, apt-get update, /etc/apt/, /etc/apt/apt.conf.d/50unattended-upgrades, /etc/apt/apt.conf.d/, /etc/apt/apt.conf.d/20auto-upgrades, apt-file, apt-utils